Systematic Drilling and Blasting for Surface Excavations Part 7 ppt

... ft 1 0.42 0. 17 2.i 3.8 2 4 .7 0 .7 17 7.8 3 3.8 1.5 57 ii.5 4 6 .7 2 .7 130 15.5 5 10.5 4“ 260 19.5 6 15 6 440 23 7 20 8 70 0 27 8 27 il i,ioo 3i 9 34 13 4,500 35 Note: Values are only for an explosive ... retain gases and reduce noise and flyrock. Table 5-1. Charge Concentration of Inclined Holes (i) for Single-Row Bench Blasting for Fragmentation with Respect to V...

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... O-2-3800 i Mar 72 SOFT ROCK BIT -FOR CLAY, SHALE, SALT, GYPSUM, CHALK, AN HYORITE, AND MEDIUM LIME ROCK. MEDIUM ROCK BIT - FOR LIME- STONE, DOLOMITE, HARD SHALE, AND AN HYDRITE. HARD ROCK BIT - FOR CHERT, QUART ... The marked insensitivity to external shock and friction makes a detonating fuse ideal for both down lines and trunk lines for primary blasting. Since the blast...

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... dimensions and elevations in feet. The drilling and blasting plan is for record purposes only, and will not absolve the Contractor of his responsibility for using proper drilling and blasting procedures. ... 3-12-3-13 Fabric. 6.4, 6 -7, 6-11-6-12 Fault breccia, 6-9-6-11 Faults, 6-9 Ferrosilicon. 3-16 Flyrock, 7- 17 7- 18 Fragmentation. 2-2, 5-24 Free face, 2-3 Fuel oil. 3...

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... Paragraph 6-3c 6-3c(I) 6-3c(2) 6-3d 6-3e 6-4 6-4a 6-4b 6-4c 6-4d 6-4e 6-5 6-6 7- i 7- 2 7- 2a 7- 2b 7- 2c 7- 2d 7- 3 7- 3a 7- 3b 7- 3C 7- 3d 7- 3e 7- 4 8-i 8-la 8-lb 8-2 8-2a 8-2b 8-2c 8-2d 6 -7 6-8 6-9 ;:;1 6-i2 6-i2 6-i3 6-13 6- i4 6- i4 6-i5 6-i6 7- i 7- 1 7- 2 7- 2 7- 4 7- 4 7- 5 7- 5 7- ii 7- 12 7- i5 7- 16 7- i7 8-i 8-1 8-i 8-2 8-2 8-2 8-3 8-3 ... Fi~.No. 5-...

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... for the future. The drilling and blasting manual for surface exca- vations is the first of this series. Selected references that describe drilling and blasting procedures and results as well ... Mar 72 Standard Storage Magazines, i9 57, Pamphlet # Safety in the Handling and Use of Explosives, 1960, Pamphlet i7 How to Destroy Explosives, Pamphlet 21 Rules for Storing,...

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... 30 40 50 60 70 80 CARTRIDGE STRENGTH, percent Fig. 3-5. Average confined velocity and specific gr~vity and calculated detonation pressure of explosives 3-8 E,M 1110-2-3800 i Mar 72 Table 3-2. Properties(i) ... Poor Fair 153 25 0.9 8,800 Poor Fair 163 20 0.8 8,300 Poor Fair 174 Low-Density Ammonia Dynamite, Low-Velocity Series 50 1.2 8,i O0 Fair Fair i20 45 i.i 7, 800 Poor Fair 129 4...

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... largely replaced dynamites and gelatins in bench blasting. Denser slurry blasting agents are supplanting dynamite and gelatin and dry blasting agents. 3-16 E,M ili O-2-3800 i Mar 72 . excavation blasting in ... will disperse relatively rapidly and uniformly. (4) Inadequate priming imparts a low initial detonation velocity to a blasting agent, and the reaction may die out...

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... iiiO-2-3800 I 1 Mar 72 CWPTER,5. BASIC SURFACE BMTING TECHNIQUES 5-1. Introduction. a. Rock blasting may be conducted for removal of rock, for con- trol of excavated rock surfaces, and for control of ... techniques used for surface excavations. Information was obtained from CE District offices and projects supplemented in less familiar procedures by references 8 and 14....

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... h0" alt="" EM iiiO-2-3800 i Mar 72 Table 5-3. Some Typical Hole Spacings and Diameters, Charge Concentrations, and Burdens for Smooth Blasting (after Langefors and Kihlstr6m14) Drill Hole Charge ... the bottom and for close hole spac- ing should be much less. (2) Relation to Main Blast. Presplitting and primary blasting are sometimes performed in one operation with the pr...

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... heav- ing effect for loosening and moving material. (2) Presplit blasting for a finished rock surface may be more difficult in highly fractured rock depending partly on the nature and atti- tude ... compressive and tensile strengths for a selected group of rocks with divergent properties. (2) Fig. 6-2 is an empirical chart useful for estimating blasthole spacing and size...

Ngày tải lên: 11/08/2014, 20:21